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Asked: 2026-06-18T03:46:07+00:00

I am using SQL Server 2012. I have a table where I am tracking

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I am using SQL Server 2012. I have a table where I am tracking single point instances in a geography column. Storing them as a single point is working fine but I am trying to group some of them together into a new table where they would be a multipoint. I can get it working by inserting lat and long into a multipoint column like this: 

DECLARE @g geography; 
SET @g = geography::STMPointFromText('MULTIPOINT(-104.952784 39.524092, -104.935269 39.542652)', 4326);
INSERT INTO test(loc) values(@g)

What I want to do is select the values from a table that are already a geography data type. I am not sure if I can do this with a basic query or if I have to build it with a loop? I cannot seem to get it working either way.

Also, after I have that is there a method that will return me the center point of a multipoint column? I have been playing with some of the methods like STStartPoint and STEndpoint but I cannot seem to find a methods that return the center point?

Any help on these questions would be great and highly appreciated.

Thanks!

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1 Answer

  1. Editorial Team

    What you’re looking for is the STCentroid() method but, unfortunately, it doesn’t work for MultiPoint objects. I raised a Connect issue for this a few years back which has been closed by Microsoft as “Won’t Fix”, but you’re welcome to vote it up anyway: https://connect.microsoft.com/SQLServer/feedback/details/588316/make-geometry-stcentroid-method-work-on-geometries-other-than-polygons

    Meanwhile, you’ll have to manually sum and then average the X and Y coordinate values individually to get the average “centre” of a Multipoint.

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